Question

③ find the area:
purple
find the diameter of the circle

Explanation:

Step1: Calculate radius from diameter

The diameter is 18, so radius $r = \frac{18}{2} = 9$

Step2: Apply circle area formula

Use $A = \pi r^2$, substitute $r=9$
$A = \pi \times 9^2 = 81\pi$
(If using $\pi \approx 3.14$, $A = 81 \times 3.14 = 254.34$)

Answer:

$81\pi$ (or approximately 254.34)